add python track2 for applicationinsights (#12833)

Author: 00Kai0

specification/applicationinsights/resource-manager/readme.md

@@ -392,6 +392,7 @@ swagger-to-sdk:
   - repo: azure-sdk-for-python
     after_scripts:
       - python ./scripts/multiapi_init_gen.py --default-api-version=2020-03-01-preview azure-mgmt-applicationinsights
+  - repo: azure-sdk-for-python-track2
   - repo: azure-sdk-for-java
   - repo: azure-sdk-for-go
   - repo: azure-sdk-for-js